In this post we'll take a glance on inheritance of objects in Node.js. we'll learn to use utility module to achieve inheritance in Node.js. but confine mind that you simply will write plain JavaScript to attain inheritance in Node also.

You'll use Object.create() to inherit one object to a different in Node.js also.

In this post we'll learn to use util module to achieve inheritance in Node.js. First, you should to import util module in your application. var util= require(‘util’);

After importing util module, allow us to say you have got an object as below,function Student() { this.name = "G Block"; this.age = 40; }; Just for demonstration allow us to add function in object using prototype, Student.prototype.Display= function(){ console.log(this.name + " is " + this.age + " years old"); }; Next we tend to we progressing to make ArtsStudent object which is able to inherit Student object.function ArtsStudent() { ArtsStudent.super_.call(this); this.subject = "music"; }; util.inherits(ArtsStudent,Student); Second line of code in ArtsStudent object is very important,ArtStudent.super_.call(this);

If you don’t call constructor of parent object as shown in above code snippet then on making an attempt to access properties of parent object will come undefined. In last line ArtStudent inherits Student using util.inherits() function ,

util.iherits(ArtsStudent,Student);

Next you can create instance of ArtsStudent and call function of parent object as below,var a = new ArtsStudent(); a.Display();

Inheritance will be chained to any order. If you want you can inherit object from ArtsStudent as well. Inherited object will contain properties from both ArtsStudent and Student objects. So let us consider one more example,function ScienceStudent() { ScienceStudent.super_.call(this); this.lab = "Physics"; } util.inherits(ScienceStudent,ArtsStudent); var b = new ScienceStudent(); b.Display();

On this example ScienceStudent object inherits both Student and ArtsStudent objects. With this example, you can work with inheritance in Node.js using util module. I hope it works for you!

HostForLIFE.eu Node.js HostingHostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.

Before starting the code you need an account in send grid which will send the notification to your mail. Generally we use email notifications for forget passwords in your applications. You can follow the below steps to get the task done and if you have any queries please leave a comment below.

We require a few modules from npm to send the notification through the mail.

npm install formidable

npm install crypto

npm install async

npm install nodemailer

In my router.js file the following code will be present app.route('/forgotpasswordResponse') .post(userCtrl.forgotpasswordResponse);

When I run my services and hit the above Url from postman it will take you to the forgotpasswordResponse method. We are using post method in postman where we need to pass Email id as parameter

In my case I am using waterfall methologie for this method with will execute acyn in method, In the above code initially I am updating the collection with resetPasswordToken and resetPasswordExpires using email id and getting my send grid credentials from db form Accountsettings collections. If you can observe in mailOptions text "req.headers.host" will be the link which will get in you mail with token.

When you click on Url which you got in the email it will redirect you to another page to set the password.

Again we need to go to route.js and the code will be some thing like this. It will take to html page which we can reset the password, app.route('/reset/:token') .get(Resetpassword.resetpasswordResponse);

It is often required to work with Node.JS and NPM package installer behind the proxy. When trying to install npm packages behind the proxy, you may come across the error, given below.

To resolve exceptions, shown above, http_proxy and https_proxy configurations needs to be done for NPM. The step by step guidance is given below to perform the configuration on Windows machine-Go to C:\User\{User} directory.

if .npmrc file exists then open it in notpad editor else create .npmrcfile.

Add the lines, given below to the file for your valid AD domain user. proxy=http://domain\\username:password@ip:port

Add the lines, given below for Non AD user proxy=http://username:password@ip:port

In this tutorial , I will discuss about Cluster Server in NodeJS. That is a group of two or more computers that work together to provide availability, reliability and scalability that can be obtained using a single computer. In a server cluster, each server owns and manages devices and applications or services that are managing local cluster.

To make the new Node Web Application open Visual Studio then select "File" -> "New Web Site" then select "Node Web Application" as in the accompanying figure:

Create a new Script file from the Solution Explorer as in the following figure:

HostForLIFE.eu Node.js HostingHostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.

HostForLIFE.eu Node.js HostingHostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.

HostForLIFE.eu Node.js HostingHostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.

In this article we will observe uploading a file on a web server made use Node.js. Stream in Node.js makes this task super simple to upload files or so far as that is concerned working with any information exchange between a server and a client. To transfer a file we will work with two modules, HTTP and fs. So let us begin with stacking these two modules in an application:

var http = require('http'); var fs = require('fs');

When modules are loaded proceed to and make a web server as below:http.createServer(function(request,response){ }).listen(8080);

So far we are great and now we wish to utilize the accompanying procedure: Make a destination write stream. In this stream the substance of the uploaded file will be written. We need to compose once again to the client the rate of data being uploaded. The first requirement could be possible utilizing a pipe. A pipe is an event of stream in Node.js. And the request is a readable stream. So we will use a pipe event to write a request to a readable stream.var destinationFile = fs.createWriteStream("destination.md"); request.pipe(destinationFile); The second necessity is to give back an of data uploaded. To do that first read the aggregate size of the file being uploaded. That could be possible by reading the content-length (line number 1 in the accompanying code snippet). At that point in the data occasion of request we will update uploadedBytes that starts at zero (line number 2). In the data event of the request we are calculating the percentage and writing it back in the response.

Presently let us utilize curl -upload-file to upload a file on the server.

As you see, while the file is being uploaded the percentage of data uploaded is returned once again to the client. So thusly you can upload a file to the server made utilizing Node.js. Hope this tutorial works for you!

In this article we will actualize a basic hit counter application with a couple of lines of code. We should examine what we truly need to do. We might simply want to actualize a basic hit count for our web server. Case in point, we realize that in ASP.NET application variables are comprehensively shareable and static in nature, as it were if a client changes a worth then all clients will see the changed variant.

In our case we will count the quantity of hits in our web server, and trust me, its much less difficult than you would anticipate. I will assume that the Node.Js server is already up and running in our system. Let’s take a look at the following code.var http = require('http'); var userCount = 0; var server = http.createServer(function (req, res) { userCount++; res.writeHead(200, { 'Content-Type': 'text/plain' }); res.write('Hello!\n'); res.write('We have had ' + userCount + ' visits!\n'); res.end(); }); server.listen(9090); console.log('server running...')

The illustration is exceptionally straightforward with our past Hello World case. In this case we have pronounced one global variable that is including the quantity of hits our web application. In the server body, from the beginning we are increasing the variable worth and afterward we are sending the quality as a reaction in the wake of setting 200 reaction statuses.

We should run the application. Go to the Command Prompt and explore to your server area. At that point fire the summon:hub <server filename>

We are seeing that our node server is running. Presently we will go to a program and attempt to get to the server.

At the outset hit, we see that its demonstrating that this is the first HTTP solicitation to our server. Presently, in the event that we hit a few more times then we will see that the number has changed as in the accompanying.

It's demonstrating the quantity of HTTP demands after the node server was up and running. The inquiry may ring a bell, for every single hit, why is the variable not introduced? The reason is, the node.js prepare any work in occasion circle system.

When we make the server and it is up, it will never stop and it will keep on listening for events. For our situation the server is listening for request and response events. Along these lines, when we make one HTTP demand , it executes the code that is composed inside the occasion scope and since we have announced a variable out of this extension, it is never instated the second time.

Conclusion In this short article we have figured out how to execute a hit counter in a HTTP server utilizing a couple of lines of code. I trust this useful illustration will support you in your node.js day. Happy Coding!

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